code: def test_T_vector(self, xp):
      a = testing.shaped_arange((4,), xp)
      return a.T
  
imports: import unittest
  import warnings
  import numpy
  import pytest
  import cupy
  from cupy import testing
label_desc: Use image node_id 7 for calling the TestArrayIndex obj's underlying member method code with example usage: obj.test_T_vector(xp) and returns: a